Welcome to The Presentation ON Knit Dyeing Faults and It’s Remedies Submitted To Rajib Saha Assistant Professor Department of Textile Engineering !"# $% &'% () *(+ *, * /+0 *(1110)23**404*($0 . 5%+ $% 6)23* ( % ( ''7 ©right Dyeing is a process of treating fabrics with dye liquors which contains both dyestuffs and chemicals and fixing the dyes in the fabric subsequently. In discussing faults which can be attributed to dyer and finisher, it is necessary first to have a general conception of some of the major operations to which goods are subjected after they are received by the finisher of wet processing . To know about the different types of wet processing faults. To know about the causes of different types of wet processing faults. To know about the remedies of different types of wet processing faults. To know about the pre-treatment process of textile goods. To know about the wet process of textile goods. To know about the finishing process of textile goods. To know about the different types of wet processing machineries. To know about the job sequence of wet processing industry. Some Faults in Knit Dyeing Processing Faults Name Faults Sample Incomplete Scouring Causes Remedy ! !! "# !! !$ !!! !$ %"# $ Faults Name Faults Sample Low degree of whiteness Causes Remedy &'(($ '$ !!$ !!'(( !!'$ !!!!$ Faults Name Faults Sample E#ect of H2O2 residues Causes Remedy '((! '(( )'((! *$ '((! '(( +'((! '((!!$ Faults Name Faults Sample E#ect of Hairiness Causes Remedy ),! '!,!*! ' -!,! .,! *&!,! ! '!/$01/$2 !,! +,!(0!$ [...]... the dye bath Faults Name Faults Sample Batch to Batch Shade variation Causes Fluctuation of Temperature Improper dosing time of dyes and chemicals Batch to batch weight variation of dyes and chemicals Dyes lot variation Remedy Use standard dyes and chemicals Maintain the same liquor ratio Follow the standard pretreatment procedure Maintain the same dyeing cycle Identical dyeing procedure... were segmented and scheduled to a systematic routine There was different faults operation in textile wet processing It should be mentioned that Alim knit tex (Mondol Group) Ltd, Metro Knit and Dying Mills Ltd, Square Knit Fabrics Ltd are 100% export oriented knit dyeing industry To produce a quality product above all export quality it could be desirable that the process should be high standard Here we... cause oil and grease spot on the dyed fabric Due to careless transport of dyed or finished fabric Remedy Must be careful about oil and grease during dyeing and finishing process Must be careful about the transportation of dyed or finished fabric With immediate application of spot –lifter Faults Name Faults Sample Pilling effect Causes Pilling is a common fabric occurring on knitted and woven... of control on dyeing m/c Remedy By ensuring even pretreatment By ensuring even heat-setting in case of synthetic fibers Proper dosing of dyes and chemicals Proper controlling of dyeing m/c Faults Name Faults Sample Line mark Causes Long time store in the floor Dyeing process not properly Extra tension on the fabric Remedy Properly stored in the after dyeing Exactly dyeing process... leveling agent which are not affected by the temperature variations Faults Name Faults Sample Shade bar Causes It may be caused by a change of filling bobbin in the loom or a loom stop and start up It is a horizontal band of a different hue running across the fabric Remedy Properly change of bobbin Faults Name Faults Sample Uneven dyeing Causes Uneven pretreatment (uneven scouring & bleaching)... Remedy Use standard dyes and chemicals Proper m/c speed Use of soft water Faults Name Faults Sample Thick –thin yarn Causes If thick/thin yarn is used for making a fabric Used of immature fiber Used of short staple length of fiber Remedy After dyeing this type of problem cannot be removed but can be avoided by not mixing the thick/thin yarn in a single fabric Faults Name Faults Sample Off... used in dyeing liquor Faults Name Faults Sample Bowing Causes Woven filling yarns lie in an arc across fabric width; in knits the course lines lay an arc across width of goods Establish standards of acceptance Critical on stripes or patterns not as critical on solid color fabrics Remedy Uniform sewing is required Equal width fabric is required Proper tension fabric passes in compactor Faults. .. from the yarn and curl up in a ball,- forming what is referred to as a pill Remedy Pilling is accentuated by the friction of normal wear, washing and routine dry cleaning Exactly maintain of enzyme wash Evenly mixing of short staple fibers Properly twisted of yarn Conclusion Two months industrial training at Alim knit tex (Mondol Group) Ltd, Metro Knit and Dying Mills Ltd, Square Knit Fabrics... Faults Name Faults Sample Poor washing fastness Causes Inadequate washing of hydrolyzed dye Inadequate removal of loosely retained dye Inherent low fastness properties of the dye Remedy Optimum washing off Use of cationic fixing agent or other fastness improving after treatment Faults Name Faults Sample Oil & Grease Spot Causes During dyeing and finishing process sometimes oil and grease... the same depth of the shade Faults Name Faults Sample Dye spot Causes Improper Dissolving of dye particle in bath Improper Dissolving of caustic soda particle in bath Remedy By proper dissolving of dyes and chemicals By passing the dissolved dyestuff through a fine stainless steel mesh strainer, so that the large undissolved particles are removed Faults Name Faults Sample Crease mark Causes . Welcome to The Presentation ON Knit Dyeing Faults and It’s Remedies Submitted To Rajib Saha Assistant Professor Department of Textile Engineering . industry. Some Faults in Knit Dyeing Processing Faults Name Faults Sample Incomplete. types of wet processing faults. To know about the causes of different types of wet processing faults. To know about the remedies of different types of wet processing faults. To know about